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首页> 外文期刊>The Bovine Practitioner >Improving Reproductive Efficiency Through the Use of Reproductive Tract Scoring in a Group of Beef Replacement Heifers
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Improving Reproductive Efficiency Through the Use of Reproductive Tract Scoring in a Group of Beef Replacement Heifers

机译：通过在一组牛肉替代小母牛中使用生殖道得分提高生殖效率

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摘要

This study investigated the potential improvement in reproductive efficiency through reproductive tract scoring (RTS) of heifers 30-60 days prior to breeding. Between 2000 and 2004 the RTS of 1986 heifers (mean age of 395 days) were determined in twolocations in Georgia as part of the Heifer Evaluation and Reproductive Development (HERD) project. These heifers were of similar age and were managed using comparable nutrition and management protocols. The Kaplan-Meier product-limit method was used to analyze the number of days from the start of the breeding period to conception for heifers with different RTS classifications. RTS was significantly associated with both time to conception and the proportion of heifers that conceived during the breeding period. The mean time to conception for heifers in the combined RTS 1 and 2 category (37.8 days) was significantly longer than for heifers with scores of 4 (19.7 days) or 5 (15.8 days), but not significantly different from heifers with RTS of 3 (29.2 days). The estimated percentages of heifers that would have conceived during a uniform 70 day breeding period were 94.6% of RTS 5, 91.2% of RTS 4, 87.6% of RTS 3, and 70.5% of RTS 1 and 2. This study indicates that reproductive tract scoring can be used to assist producers in the selection of heifers that will conceive at a higher rate and breed earlier in the breeding season.
机译：这项研究调查了在繁殖前30-60天通过小母牛的生殖道评分（RTS）来提高生殖效率。在2000年至2004年之间，作为小母牛评估和生殖发展（HERD）项目的一部分，在佐治亚州的两个地点确定了1986年小母牛的RTS（平均年龄395天）。这些小母牛的年龄相近，并使用可比的营养和管理方案进行管理。使用Kaplan-Meier乘积限制法来分析具有不同RTS分类的小母牛从繁殖期开始到受孕的天数。 RTS与受孕时间和育种期间小母牛的比例均显着相关。 RTS 1和2组合类别的小母牛的平均受孕时间（37.8天）明显比得分为4（19.7天）或5（15.8天）的小母牛长，但与RTS为3的小母牛没有显着差异（29.2天）。在统一的70天繁殖期中，预计受孕的小母牛百分比为94.6％的RTS 5、91.2％的RTS 4、87.6％的RTS 3和70.5％的RTS 1和2。得分可用于帮助生产者选择受精率更高，在繁殖季节较早繁殖的小母牛。

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